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#11
That would be because you've downloaded the "Itanium" (IA-64) version, as opposed to the "x64" build.
For whatever misguided reason (alphabetisation?), they've placed the Itanium version of the download, which is used in <1% of cases, ahead of the x64 build, which constitutes the other >99% of the 64-bit install base.
Your specs suggest you're running x64 Windows. Make sure you're downloading and trying to install the "x64" version of the tools.